Exchange4linux

exchange4linux is a collaborative software solution that provides email- and webmail server, common address book, calendar, notes and tasks. It is designed to integrate with Microsoft Office Outlook and third-party tools like PDA-sync or Duplicates Remover for Outlook. It is meant as an alternative to Microsoft Exchange Server or Microsoft Small Business Server.

The product is no longer available for download from the official site. Product support will end in October 2007.

The community-supported open source project exchange4linux is developed by Neuberger & Hughes GmbH, located in Plochingen, Germany.

exchange4linux server suite 3.x, the commercially supported version of exchange4linux, contains all features in the open source version, a web-based administration frontend, support and software maintenance, optionally with Kaspersky Viruswall and Easy PDF Service.

Read more about Exchange4linux:  Technology, Features, Current State